Most Serene Republic (Latin: Serenissima Respublica; Italian: Serenissima Repubblica; Polish: Najjaśniejsza Rzeczpospolita) is a title attached to a number of European states through history. By custom, the appellation "Most Serene" is an indicator of sovereignty (see also Serene Highness or Most Serene Highness for a sovereign prince). When used in the past, the title "Most Serene Republic" emphasized the sovereignty of the republic.
Currently, no country officially calls itself a "Most Serene Republic".[1] San Marino, officially "the Republic of San Marino" (Italian: Repubblica di San Marino) and Poland, officially "the Republic of Poland" are the only two modern independent nations still sometimes referred to by the style, being at times unofficially called "the Most Serene Republic of San Marino" (Italian: Serenissima Repubblica di San Marino)[2] and "the Most Serene Republic of Poland" (Polish: Najjaśniejsza Rzeczpospolita).[citation needed]